Certain lots of a supplement known as L-citrulline, used to treat genetic disorders found mostly in children, has been found to contain none of the drug. The compounding company that sold the drug, Medisca Inc, is warning doctors and parents not to use it.

The U.S. Food and Drug Administration (FDA) announced the discovery on Saturday and said the company is voluntarily recalling eight lots of the L-citrulline. The agency also said it has received several adverse event reports associated with the supplement, according to Reuters.

According to the FDA, tests conducted by Medisca showed the affected lots did not contain any L-citrulline, which is used to treat certain urea cycle disorders, which are rare genetic conditions found primarily in children, Reuters reported.

L-citrulline is a naturally occurring amino acid found in certain foods, including watermelon. In addition to genetic disorders, it is also used to treat other serious conditions, including Alzheimerâ€™s disease, dementia, fatigue, sickle cell disease, diabetes, and heart disease, according to WebMD.com.

Medisca said in a statement obtained by Reuters that the absence of L-citrulline made the supplements a potential health hazard, and warned that they should not be used for any purpose, according to Reuters.